Cycles OSL: add diffuse_ramp closure in addition to phong_ramp.

intern/cycles/kernel/CMakeLists.txt

@@ -49,6 +49,7 @@ set(SRC_CLOSURE_HEADERS
 	closure/bsdf.h
 	closure/bsdf_ashikhmin_velvet.h
 	closure/bsdf_diffuse.h
+	closure/bsdf_diffuse_ramp.h
 	closure/bsdf_microfacet.h
 	closure/bsdf_oren_nayar.h
 	closure/bsdf_phong_ramp.h

intern/cycles/kernel/closure/bsdf_diffuse_ramp.h

@@ -0,0 +1,96 @@
+/*
+ * Adapted from Open Shading Language with this license:
+ *
+ * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
+ * All Rights Reserved.
+ *
+ * Modifications Copyright 2012, Blender Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * * Neither the name of Sony Pictures Imageworks nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __BSDF_DIFFUSE_RAMP_H__
+#define __BSDF_DIFFUSE_RAMP_H__
+
+CCL_NAMESPACE_BEGIN
+
+__device float3 bsdf_diffuse_ramp_get_color(const ShaderClosure *sc, const float3 colors[8], float pos)
+{
+	int MAXCOLORS = 8;
+	
+	float npos = pos * (float)(MAXCOLORS - 1);
+	int ipos = (int)npos;
+	if (ipos >= (MAXCOLORS - 1))
+		return colors[MAXCOLORS - 1];
+	float offset = npos - (float)ipos;
+	return colors[ipos] * (1.0f - offset) + colors[ipos+1] * offset;
+}
+
+__device int bsdf_diffuse_ramp_setup(ShaderClosure *sc)
+{
+	sc->type = CLOSURE_BSDF_DIFFUSE_RAMP_ID;
+	return SD_BSDF | SD_BSDF_HAS_EVAL;
+}
+
+__device void bsdf_diffuse_ramp_blur(ShaderClosure *sc, float roughness)
+{
+}
+
+__device float3 bsdf_diffuse_ramp_eval_reflect(const ShaderClosure *sc, const float3 colors[8], const float3 I, const float3 omega_in, float *pdf)
+{
+	float3 N = sc->N;
+
+	float cos_pi = fmaxf(dot(N, omega_in), 0.0f);
+	*pdf = cos_pi * M_1_PI_F;
+	return bsdf_diffuse_ramp_get_color(sc, colors, cos_pi) * M_1_PI_F;
+}
+
+__device float3 bsdf_diffuse_ramp_eval_transmit(const ShaderClosure *sc, const float3 colors[8], const float3 I, const float3 omega_in, float *pdf)
+{
+	return make_float3(0.0f, 0.0f, 0.0f);
+}
+
+__device int bsdf_diffuse_ramp_sample(const ShaderClosure *sc, const float3 colors[8], float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
+{
+	float3 N = sc->N;
+
+	// distribution over the hemisphere
+	sample_cos_hemisphere(N, randu, randv, omega_in, pdf);
+
+	if(dot(Ng, *omega_in) > 0.0f) {
+		*eval = bsdf_diffuse_ramp_get_color(sc, colors, *pdf * M_PI_F) * M_1_PI_F;
+#ifdef __RAY_DIFFERENTIALS__
+		*domega_in_dx = (2 * dot(N, dIdx)) * N - dIdx;
+		*domega_in_dy = (2 * dot(N, dIdy)) * N - dIdy;
+#endif
+	}
+	else
+		*pdf = 0.0f;
+	
+	return LABEL_REFLECT|LABEL_DIFFUSE;
+}
+
+CCL_NAMESPACE_END
+
+#endif /* __BSDF_DIFFUSE_RAMP_H__ */

intern/cycles/kernel/osl/CMakeLists.txt

@@ -14,6 +14,7 @@ set(INC_SYS
 
 set(SRC
 	background.cpp
+	bsdf_diffuse_ramp.cpp
 	bsdf_phong_ramp.cpp
 	emissive.cpp
 	osl_closures.cpp

intern/cycles/kernel/osl/bsdf_diffuse_ramp.cpp

@@ -0,0 +1,115 @@
+/*
+ * Adapted from Open Shading Language with this license:
+ *
+ * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
+ * All Rights Reserved.
+ *
+ * Modifications Copyright 2011, Blender Foundation.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * * Neither the name of Sony Pictures Imageworks nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <OpenImageIO/fmath.h>
+
+#include <OSL/genclosure.h>
+
+#include "osl_closures.h"
+
+#include "kernel_types.h"
+#include "kernel_montecarlo.h"
+#include "closure/bsdf_diffuse_ramp.h"
+
+CCL_NAMESPACE_BEGIN
+
+using namespace OSL;
+
+class DiffuseRampClosure : public CBSDFClosure {
+public:
+	DiffuseRampClosure() : CBSDFClosure(LABEL_DIFFUSE) {}
+	Color3 colors[8];
+	float3 fcolors[8];
+
+	size_t memsize() const { return sizeof(*this); }
+	const char *name() const { return "diffuse_ramp"; }
+
+	void setup()
+	{
+		sc.N = TO_FLOAT3(N);
+		m_shaderdata_flag = bsdf_diffuse_ramp_setup(&sc);
+
+		for(int i = 0; i < 8; i++)
+			fcolors[i] = TO_FLOAT3(colors[i]);
+	}
+
+	bool mergeable(const ClosurePrimitive *other) const
+	{
+		return false;
+	}
+
+	void blur(float roughness)
+	{
+		bsdf_diffuse_ramp_blur(&sc, roughness);
+	}
+
+	void print_on(std::ostream &out) const
+	{
+		out << name() << " ((" << sc.N[0] << ", " << sc.N[1] << ", " << sc.N[2] << "))";
+	}
+
+	float3 eval_reflect(const float3 &omega_out, const float3 &omega_in, float& pdf) const
+	{
+		return bsdf_diffuse_ramp_eval_reflect(&sc, fcolors, omega_out, omega_in, &pdf);
+	}
+
+	float3 eval_transmit(const float3 &omega_out, const float3 &omega_in, float& pdf) const
+	{
+		return bsdf_diffuse_ramp_eval_transmit(&sc, fcolors, omega_out, omega_in, &pdf);
+	}
+
+	int sample(const float3 &Ng,
+	           const float3 &omega_out, const float3 &domega_out_dx, const float3 &domega_out_dy,
+	           float randu, float randv,
+	           float3 &omega_in, float3 &domega_in_dx, float3 &domega_in_dy,
+	           float &pdf, float3 &eval) const
+	{
+		return bsdf_diffuse_ramp_sample(&sc, fcolors, Ng, omega_out, domega_out_dx, domega_out_dy,
+			randu, randv, &eval, &omega_in, &domega_in_dx, &domega_in_dy, &pdf);
+	}
+};
+
+ClosureParam *closure_bsdf_diffuse_ramp_params()
+{
+	static ClosureParam params[] = {
+		CLOSURE_VECTOR_PARAM(DiffuseRampClosure, N),
+		CLOSURE_COLOR_ARRAY_PARAM(DiffuseRampClosure, colors, 8),
+		CLOSURE_STRING_KEYPARAM("label"),
+	    CLOSURE_FINISH_PARAM(DiffuseRampClosure)
+	};
+	return params;
+}
+
+CLOSURE_PREPARE(closure_bsdf_diffuse_ramp_prepare, DiffuseRampClosure)
+
+CCL_NAMESPACE_END
+

intern/cycles/kernel/osl/osl_closures.cpp

@@ -196,6 +196,8 @@ void OSLShader::register_closures(OSLShadingSystem *ss_)
 		closure_ambient_occlusion_params(), closure_ambient_occlusion_prepare);
 	register_closure(ss, "phong_ramp", id++,
 		closure_bsdf_phong_ramp_params(), closure_bsdf_phong_ramp_prepare);
+	register_closure(ss, "diffuse_ramp", id++,
+		closure_bsdf_diffuse_ramp_params(), closure_bsdf_diffuse_ramp_prepare);
 }
 
 CCL_NAMESPACE_END

intern/cycles/kernel/osl/osl_closures.h

@@ -48,12 +48,14 @@ OSL::ClosureParam *closure_background_params();
 OSL::ClosureParam *closure_holdout_params();
 OSL::ClosureParam *closure_ambient_occlusion_params();
 OSL::ClosureParam *closure_bsdf_phong_ramp_params();
+OSL::ClosureParam *closure_bsdf_diffuse_ramp_params();
 
 void closure_emission_prepare(OSL::RendererServices *, int id, void *data);
 void closure_background_prepare(OSL::RendererServices *, int id, void *data);
 void closure_holdout_prepare(OSL::RendererServices *, int id, void *data);
 void closure_ambient_occlusion_prepare(OSL::RendererServices *, int id, void *data);
 void closure_bsdf_phong_ramp_prepare(OSL::RendererServices *, int id, void *data);
+void closure_bsdf_diffuse_ramp_prepare(OSL::RendererServices *, int id, void *data);
 
 enum {
 	AmbientOcclusion = 100

intern/cycles/kernel/shaders/stdosl.h

@@ -434,6 +434,7 @@ string concat (string a, string b, string c, string d, string e, string f) {
 closure color diffuse(normal N) BUILTIN;
 closure color oren_nayar(normal N, float sigma) BUILTIN;
 closure color phong_ramp(normal N, float exponent, color colors[8]) BUILTIN;
+closure color diffuse_ramp(normal N, color colors[8]) BUILTIN;
 closure color translucent(normal N) BUILTIN;
 closure color reflection(normal N) BUILTIN;
 closure color refraction(normal N, float eta) BUILTIN;

intern/cycles/kernel/svm/svm_bsdf.h

@@ -20,6 +20,7 @@
 #include "../closure/bsdf_diffuse.h"
 #include "../closure/bsdf_oren_nayar.h"
 #include "../closure/bsdf_phong_ramp.h"
+#include "../closure/bsdf_diffuse_ramp.h"
 #include "../closure/bsdf_microfacet.h"
 #include "../closure/bsdf_reflection.h"
 #include "../closure/bsdf_refraction.h"
@@ -48,6 +49,10 @@ __device int svm_bsdf_sample(const ShaderData *sd, const ShaderClosure *sc, floa
 		/*case CLOSURE_BSDF_PHONG_RAMP_ID:
 			label = bsdf_phong_ramp_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
 				eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
+			break;
+		case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
+			label = bsdf_diffuse_ramp_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
+				eval, omega_in, &domega_in->dx, &domega_in->dy, pdf);
 			break;*/
 		case CLOSURE_BSDF_TRANSLUCENT_ID:
 			label = bsdf_translucent_sample(sc, sd->Ng, sd->I, sd->dI.dx, sd->dI.dy, randu, randv,
@@ -117,6 +122,9 @@ __device float3 svm_bsdf_eval(const ShaderData *sd, const ShaderClosure *sc, con
 				break;
 			/*case CLOSURE_BSDF_PHONG_RAMP_ID:
 				eval = bsdf_phong_ramp_eval_reflect(sc, sd->I, omega_in, pdf);
+				break;
+			case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
+				eval = bsdf_diffuse_ramp_eval_reflect(sc, sd->I, omega_in, pdf);
 				break;*/
 			case CLOSURE_BSDF_TRANSLUCENT_ID:
 				eval = bsdf_translucent_eval_reflect(sc, sd->I, omega_in, pdf);
@@ -223,6 +231,9 @@ __device void svm_bsdf_blur(ShaderClosure *sc, float roughness)
 			break;
 		/*case CLOSURE_BSDF_PHONG_RAMP_ID:
 			bsdf_phong_ramp_blur(sc, roughness);
+			break;
+		case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
+			bsdf_diffuse_ramp_blur(sc, roughness);
 			break;*/
 		case CLOSURE_BSDF_TRANSLUCENT_ID:
 			bsdf_translucent_blur(sc, roughness);

intern/cycles/kernel/svm/svm_types.h

@@ -313,6 +313,7 @@ typedef enum ClosureType {
 
 	CLOSURE_BSDF_DIFFUSE_ID,
 	CLOSURE_BSDF_OREN_NAYAR_ID,
+	CLOSURE_BSDF_DIFFUSE_RAMP_ID,
 
 	CLOSURE_BSDF_GLOSSY_ID,
 	CLOSURE_BSDF_REFLECTION_ID,